pandas设置值

import numpy as np
import pandas as pd

dates = pd.date_range('20200101', periods=6)
df = pd.DataFrame(np.arange(24).reshape((6, 4)), index=dates, columns=['A', 'B', 'C', 'D'])
print(df)

 

 

# 以索引形式进行选择iloc
df.iloc[2,2]=1111
print(df)

 

 

# 以标签形式进行选择loc
df.loc['20200102', 'B'] = 777
print(df)